Sand-blast apparatus.



H. LUGKENBAGH.

SAND BLAST APPARATUS. APPLICATION FILED JUNE13, 1905.

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PATENTED JUNE 5, 1906.

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- UNITED srA rns- PATENT OFFICE.

HARRY LUCKENBACH, OF SAN FRANCISCO, CALIFORNIA, ASSIGNOR TO WILLIAM H.KELLY, OF SAN FRANCISCO, CALIFORNIA.

SAND-BLAST APPARATUS.

To aZZ whom it may concern.-

Be it known that I, HARRY LUCKENBAOH, a citizen of the United States,residing at San Francisco, in the county of San Francisco and State ofCalifornia, have invented certain new and useful Improvements inSand-Blast Apparatus, of which the following is a specification.

This invention relates to an improved sand-blast apparatus, the objectof the invention being to provide an apparatus for cleaning buildings orremoving iron-rust, paint, or the like which shall be cheap and simplein construction and convenient and effective in operation.

In the accompanying drawings, Figure 1 is a side elevation of theapparatus as a whole. Fig. 2 is a longitudinal section of the nozzle.

Referring to the drawings, 1 represents an air-com ressor deliveringcompressed air by a flexib e tube 2 to a coupling 3, connected to therear end of a nozzle 4. Connected with a lateral opening 5 in saidnozzle is an elbow 6, connected by a coupling 7 with a flexible tube 8,leading from a box 9 for containing sand.

Said nozzle 4 is formed with a conical seat or spout 10, into which isscrewed a tip 11, the

form of which is of importance for the success-- ful operation of theinvention. The opening therethrough includes a cylindrical rear aperture12 of uniform diameter leading to a cylindrical front aperture 13, alsoof uniform diameter, but less than that of the aperture 12. The end ofthe aperture 12 next to the a erture 13 is square to said apertures. helength of the aperture 13 is substantially twice Compressed airdischarging from such an aperture will form a narrow cylindrical jet notspreading to any considerable extent.

On the opposite side of the nozzle to the oppning 5 is an opening 17,connected b an e ow 18'With a flexible tube 19, leading om a vessel 20containing water.

In the mouth of the nozzle is secured by a set screw 14 a Wearing-ring15,-the aperture 16 of which converges from the rear to the front end,but at its narrowest point is much Wider than the aperture 13. Thecompressed air passing centrally through the aperture 1.6 in a narrowbody sucks therewith sand pass ing down the tube 8. While the sand-box 9Specification of Letters Patent.

Application filed June 13,

ishere shown as at a higher level than the nozzle 4, it has been foundin practice that With a sullicient pressure the suction is sullicient todraw the sand. upward from a lower level. At the same time Water issucked up through the tube 19, and the sand and water thus drawn intothe nozzle are discharged together with the compressed air from the toclean rusty-iron, the sides of buildings, or other material for which asand-blast a paratus is ordinarily used. The additiono the water servesto render the blast more efl'ective and also kee )8 down the dust.

The word. air in the claims is to be understood in the broad sense ofany gaseous fluid, such as steam, which is the equivalent thereof forthe objects of the apparatus.

I claim V 1. A sand-blast apparatus comprising a able Wearing-ring, anda tip discharging comressed air through said wearing-ring, said tipiiaving a discharge-hole of a length twice lts diameter, the surface ofthe metal ad acent to the rear "end of said hole being square to ingcompressed air, a flexible conduit connecting said device with the rearend of said nozzle, a receptacle for sand, and a flexible pipeconnecting said receptacle with the nozzle between the discharge-tip andwearingring, substantially as described.

2. In an apparatus of the character described, the combination of anozzle having a discharge end, the inner surface of which converges tothe end thereof, and having a t p for discharging compressed air throughsaid discharge end, the length of the discharge-aperture'of said tipbeing substantially twice its diameter and the surface thereofimmediately at the rear of said aperture being square to said a erture,means for furnishing compresse air, a flexible ipc connect ng said meanswith the rear on of said nozzle, a receptacle for sand, and a flexiblepi 0 connecting said rece tacle with the nozz e between the tip and t edischarge end of the nozzle, substantially as described.

3. In an apparatus of the character described, the oombination of anozzle having a discharge end, and having a tip for dischargnozzlehaving in its discharge end a removaperture 16 with great force and maybe used the axis of said hole, a device forproviding compressed airthrough said discharge In witness whereof I have hereunto set my I end,meansforfurnishing compressed. air, a handrin'the presence of twosubscribing wit- 1o flexibledpie coinnecgng said meaills fWith tlcllenesses.

rear en 0 sai noz e .a receptac e or san v v a receptacle for waterjandflexible pipes con HARRY LUOKENBAOH' necting said receptacles withthenozzle be- Witnesses: tween the tip and the discharge end of theFRANCIS M. WRIGHT,

nozzle, substantially as described, BESSIE GORFINKEL.

